package controller;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import transfer.*;

/**
 *
 * @author Sergey
 */
public class FrontControllerFilter implements Filter {

    private FilterConfig filterConfig = null;
    public static final String adminPattern = "/OSSystem-war/admin/";

    public FrontControllerFilter() {
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
        try {
            if (getCurrentURL(request).contains(adminPattern)) {
                adminPagesControl(request, response, chain);
            } else {
                chain.doFilter(request, response);
            }
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Destroy method for this filter
     */
    public void destroy() {
    }

    /**
     * Init method for this filter
     */
    public void init(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Return a String representation of this object.
     */
    public String toString() {
        if (filterConfig == null) {
            return ("FrontControllerFilter()");
        }
        StringBuffer sb = new StringBuffer("FrontControllerFilter(");
        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
    }

    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);

        if (stackTrace != null && !stackTrace.equals("")) {
            try {
                response.setContentType("text/html");
                PrintStream ps = new PrintStream(response.getOutputStream());
                PrintWriter pw = new PrintWriter(ps);
                pw.print("<html>\n<head>\n<title>Error</title>\n</head>\n<body>\n"); 

                // PENDING! Localize this for next official release
                pw.print("<h1>The resource did not process correctly</h1>\n<pre>\n");
                pw.print(stackTrace);
                pw.print("</pre></body>\n</html>"); 
                pw.close();
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return stackTrace;
    }

    public void log(String msg) {
        filterConfig.getServletContext().log(msg);
    }

    private String getCurrentURL(ServletRequest request) {
        return ((HttpServletRequest) request).getRequestURL().toString();
    }

    private void adminPagesControl(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException, NullPointerException {
        HttpSession session = ((HttpServletRequest) request).getSession();
        if ((session.getAttribute(SessionAttribute.SIGN_IN) != null)
                && ((Boolean) session.getAttribute(SessionAttribute.SIGN_IN)).booleanValue()) {

            for (int i = 0; i < ((User) session.getAttribute(SessionAttribute.USER)).getRoles().size(); i++) {
                String nameRole = ((UserRole) (((User) session.getAttribute(SessionAttribute.USER)).getRoles().get(i))).getNameRole();
                if (nameRole.equals(UserRole.NAME_ADMIN) || nameRole.equals(UserRole.NAME_COURIER)
                        || nameRole.equals(UserRole.NAME_WAREHOUSE_EMPLOYEE)) {
                    chain.doFilter(request, response);
                    break;
                }
            }
        } else {
            ((HttpServletResponse) response).sendRedirect("/OSSystem-war/index.jsp");
        }
    }
}
